Enhanced Ferromagnetism from Organic–Cerium Oxide Hybrid Ultrathin Nanosheets

Journal Article · Tue Nov 05 00:00:00 EST 2019 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.9b15841· OSTI ID:1635635

Yan, Guangyuan  ^[1]; Wang, Yizhan  ^[2]; Zhang, Ziyi  ^[2]; Li, Jun  ^[2]; Carlos, Corey ^[2]; German, Lazarus N. ^[2]; Zhang, Chenyu ^[2]; Wang, Jingyu ^[2]; Voyles, Paul M.  ^[2]; Wang, Xudong  ^[2]

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1. Univ. of Wisconsin-Madison, WI (United States); Dalian Univ. of Technology (China)
2. Univ. of Wisconsin-Madison, WI (United States)

Room-temperature ferromagnetism in two-dimensional (2D) oxide materials is an intriguing phenomenon for spintronic applications. Here, we report significantly enhanced room-temperature ferromagnetism observed from ultrathin cerium oxide nanosheets hybridized with organic surfactant molecules. The hybrid nanosheets were synthesized by ionic layer epitaxy over a large area at the water–air interface. The nanosheets exhibited a saturation magnetization of 0.149 emu/g as their thickness reduced to 0.67 nm. This value was 5 times higher than that for CeO₂ thin films and more than 20 times higher than that for CeO₂ nanoparticles. The magnetization was attributed to the high concentration (15.5%) of oxygen vacancies stabilized by surfactant hybridization as well as electron transfer between organic and oxide layers. Lastly, this work brings an effective strategy of introducing strong ferromagnetism to functional oxide materials, which leads to a promising route toward exploring new physical properties in 2D hybrid nanomaterials.

• Research Organization: Univ. of Wisconsin-Madison, WI (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); Army Research Office (ARO); National Science Foundation (NSF)
• Grant/Contract Number: FG02-08ER46547; AC02-06CH11357; W911NF-16-1-0198; DMR-1709025
• OSTI ID: 1635635
• Journal Information: ACS Applied Materials and Interfaces, Vol. 11, Issue 47; ISSN 1944-8244
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ferromagnetism
organic−oxide hybrid
two-dimensional nanomaterials
ionic layer epitaxy
oxygen vacancies
thickness
two-dimensional materials
magnetic properties
surfactants
X-ray photoelectron spectroscopy